Boat joint construction



Sept. 29, 1931. Q E S 1,825,091

BOAT JOINT CONSTRUCTION Filed Aug. 2, 1930 Patented Sept. 29, 1931 cmvbn n. nannie or rnmrmnono; durum; CANADA near-mm oonsrnrrc'now nlieationmec Au ust 2', 1930; swarm; 472,528.

i5 absorbing moisture to eii -ectivel-y the joint against the ingress out water therethrouglm A further important feature consists the novel arrangement of an additional packing 20 in the joint. 1 i v A further and very'important feature of the invention consists in the simple method of constructing the joint and placinglthe pack:

ingtherein. 7

In the drawings, Figure 1 is aplan view of the simple mechanism forsformingmy improved joint. 'i V Figure 2 is an enlarged-cross section through the line-2-2 of Fignre 1;, I

Figure 3 is an enlarged sectional detail showing the compressing disc in operation. Figure 4 is an enlargedflsectional detail showing the cord placing disc in operation Figure 5 is amuchenlarged'sectional view showing the manner of placing the cord in the compressed groove in the wood fibres;

Figure 6 is an enlarged detail showing a modified method ct making a joint. v Figure 7 is a sectional view of a plank com- 0 pleted after being treated as in Figure 6.-

Figure 8 is a sectional view of the plank shown in Figure 7 ,--illustra-t ing' the manner in which thefibresexpand to form a Water-tight J' in Figure 9 compressingithe fibres.

strip of fibrous material'such asa piece o f a sectional perspective detail of a portion of a boat hull constructed in accord-f ance with this invention. r

It has been quite common for a number of, years in the boat building art toiormithei planking of long narrow strips having-eachedge cut; away in what is known as a ship lap.- -These strips arelappedone'over the other and they are nailed to be cross ribbedt This form of joint is a fairly good one but it is-desi-rable to make a perfect seal atthe angles between. the meeting faces of the lapped joint and to accomplish this result I have devised every simple, though very eflec ti've method ofmanufacturm i The strips when formed with their lapped: edges are placed uponf atable 1' and one lapped i edge is pressed against a'lon'gitudinalguide' 2' by -means of a shoe .3 which is pivotal-1y mounted one pin- 4 secured inthe table.

A bracket 11 is secured to'the table: with its top edge flush-with the table top and it 1 A lever 5 pivotally mounted on a pivot; bolt fisecured tothe table has'the end? press? ing against the back of the shoe 3 and ten sion is aEpplied-to-the lever'by means of a cord 8" and weight 9, which extends over a pulley 7o 10- V W i l f i 7 t i a pair-of rollers 13 and 14 are arranged in i said-slots'and mounted in fixed bearnns I The roller'fl 3' is fpreferably formed with a I V edge' which pressesinto the fibres of thewood theang'le or the meeting faces of the; lap and jforinsa narrow groove therein "he roller 14 is provided with a" conserved edge which follows over the compressed corner in the wood strip and acts to 'gii dea;

cord'into the groove. vThe Gordie; into the groove for-med bythe'rolle'r lfi'beforethe fibres recover fromthe pressure applied thereby and a partial recovery 'of the; 99

' to leak the water first has access to the grain pressedportion to seal against the lapped of the wood andthe c'ord strip and the wood which has been compressed swells and presses outwardly, pressing the cord'against the adjoining surface of theadjacent wood strip The cord and the expanded wood thus topperate to make a thoroughly water-tight; joint and as such joint occurs twice in each lappedpair of strips it vwill be realized that the joint will be made very secure against the ingress ofwaten f a The result desired maybe acquired for certain types of boats without the use of the cord. In such cases a roller 15 formedwith a more or less squared flange 16 compresses the wood at the angle of the jo nt forming a groove 17. After passing the roller 15, the edge 18 at one side of the groove is partly cut away, leaving the groove quite shallow but the wood which has been compressed when subject to moisture will swell and form a projection as shown at 19 in Figure 8 This swelling of the wood is very effective in sealing the joints where the boat is not subject to too much'vi'bration. Y

The bracket 11 is provided with a flange 19 on its outer side in which set screws 20 are threaded. These set screws bear againstithe block 12 and enable the adjustment 'of'the' rollers in relation to the guide to regulate the depth of the compressed groove formed in the wood fibres;

A boat hull when constructed'of wood I strips manufactured in the manner described will be extremely safe and ensures the boat tongue of theadjoiningstripforminga selfas" I sealing j0int.--

' 2. A method offormi'ngwater-tight joints in woodstrips, consistingin forming the wood strips with lapped edges, compressing the fibres ofthe wood in. the angles ofthe lap, inserting a fibrous strip into. the comedge portion ofthe mating strip, and securing the wood strips together.

3. Ina method of jointing wood} strips;

in water-tight joints, the steps of running the wood strips longitudinally in pressure contact with a roller to compress a narrow strip of the fibre and directing a cord under a second roller into the groove formed by the depression of the fibres.

tion of the other member,

5' A method of forming water-tight joints in woodstrips, consisting in forming the adjoining edges of the wood strips with interfitting .tongue and groove formations, deforming the wall of the groove of one member in'alignment with the interfitting tongue of the other member, then laying a length of corded fibrous material in the deformation of the groove wall to form a seal against the interfittin'g' tongue of the other member.

6.;' A method offo'rming water-tight joints in'wood-strips, consisting in forming the ad-- j oining edges ofthewood strips with interfitting tongue and groove formations, depressing the fibres of thegroove wall for a portion of its width, and cuttin away the adj ac'e'nt" non-depressed portion 0 the groove wall forming a self-sealing joint;

In a method of forming water-tight jointsfbetweenffibrous strips, the steps of compressing longitudinally the side edge of One strip to form a groove and laying a length of corded fibrous material in the longitudinal roovefso' formed utilizing the expansive' edort of the compressed portion to displace-the corded fibrous" material outwardly in pressure sealing'engagement with the surface of the opposing strip. V

v 8. A construction unit comprising 'a' wood strip having a length-of cord embedded in a groove extending longitudinally of the edge thereof said groove being formed by compressing the fibres of the strip whereby the expansive effort of the compressed fibres tendsto displace the embedded cord outwe dly-1.".

9.)A construction unit comprising a wood strip having a mating groove in the edge, the fibres of the mating groove wall being depressed'in part to form a second longitudiin said second g'roove; V I

10. In beat joint" construction, wood strips formed with lapped edgesand having the wood; at theinsideangle of the lap compressed in a continuous longitudinal strip capable of" swelling outwardly under the ef feet of moisture to effect a sealed joint with nal groove, and a length of cord embedded strip.

the lapped edge portipn ofthe mating woodv 11. A construction unit comprising a wood strip having an angular mating groove extending longitudinally of the edge, and a length of cord embedded in the groovewall at the angle. I

12. A construction unit comprising a wood strip having a longitudinalmatin groove formed in the edge presenting angu arly related groove Walls, and a length of cord em- IO bedded in one of said groove Walls adjacent their meeting angle.

CLAUDE H. ROGERS. 

